Shelf



FIG. 1 is a front perspective of a shelf showing our new design;

FIG. 2 is a rear perspective view of the shelf view thereof;

FIG. 3 is front view of the shelf view thereof;

FIG. 4 is back view of the shelf view thereof;

FIG. 5 is side view of the shelf view thereof;

FIG. 6 is side view of the shelf view thereof;

FIG. 7 is top view of the shelf view thereof; and,

FIG. 8 is bottom view of the shelf view thereof.

The broken lines represent unclaimed boundaries of the design. The unshaded regions and regions demarcated by broken lines form no part of the claimed design. The broken lines showing the/a mounting points are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a shelf, as shown and described. 